The Sporting Chance (The Saint TV Series)

Plot
Whilst on a fishing trip in Canada, the Saint encounters Professor Mueller, who's being tricked and lied to in order to defect to the Russians with a satellite system he's invented. Using the release of his family, as bait, the professor's taken to a remote cabin where he's to board a sea plane. But if the professor boards this plane, he'll never see his family nor freedom again.

Miscellaneous

 * The opening says Manitou Lake - Ontario. But the one in Ontario is actually called Lake Manitou. Confusingly, there is a Manitou Lake in Saskatchewan.
 * The Inspector's credited surname is Hackett, but just Hacket on his office door.

Origin
This episode was adapted from a story of the same name from the 1956 book The Saint Around the World.